Onboard Diagnostic System - Obd Ii; Loose Fuel Filler Cap Message - Jeep Cherokee 2015 Owner's Manual

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ONBOARD DIAGNOSTIC SYSTEM — OBD II

Your vehicle is equipped with a sophisticated onboard

diagnostic system called OBD II. This system monitors

the performance of the emissions, engine, and automatic

transmission control systems. When these systems are

operating properly, your vehicle will provide excellent

performance and fuel economy, as well as engine emis-

sions well within current government regulations.

If any of these systems require service, the OBD II system

will turn on the "Malfunction Indicator Light (MIL)." It

will also store diagnostic codes and other information to

assist your service technician in making repairs. Al-

though your vehicle will usually be drivable and not

need towing, see your authorized dealer for service as

soon as possible.

MAINTAINING YOUR VEHICLE 639

• Prolonged driving with the MIL on could cause

further damage to the emission control system. It

could also affect fuel economy and driveability.

The vehicle must be serviced before any emissions

tests can be performed.

• If the MIL is flashing while the engine is running,

severe catalytic converter damage and power loss

will soon occur. Immediate service is required.

If the vehicle diagnostic system determines that the fuel

filler cap is loose, improperly installed, or damaged, a

"CHECK GASCAP" message will be displayed in the

Electronic Vehicle Information Center (EVIC) or Driver

Information Display (DID). Refer to "Electronic Vehicle

Information (EVIC) or

(DID)" in "Understanding Your Instrument Panel" for

Driver Information Display

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